linux-kernel - [PATCH] gpio: take in account the active low flag when configuring the gpio as an ouput

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Date:	Mon, 10 Feb 2014 16:03:34 +0100
From:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:	linus.walleij@...aro.org, gnurou@...il.com
Cc:	linux-gpio@...r.kernel.org, richard.genoud@...il.com,
	linux-kernel@...r.kernel.org,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: [PATCH] gpio: take in account the active low flag when configuring the gpio as an ouput

The initial value of the gpio is passed to gpiod_direction_output. Currently
this value is the raw value of the GPIO line, but it should be the logical
value.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
---
 drivers/gpio/gpiolib.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4e10b10..111a1f1 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1751,6 +1751,9 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
 		return -EINVAL;
 	}
 
+	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+		value = !value;
+
 	/* GPIOs used for IRQs shall not be set as output */
 	if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
 		gpiod_err(desc,
-- 
1.8.5.3

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